docs: def format(ctx):
      """ Auto format package source files.
      """
  
      isort_command = f"isort -rc {ctx.package.directory!s}"
      black_command = f"black {ctx.package.directory.parent!s}"
  
      report.info(ctx, "package.format", "sorting imports")
      ctx.run(isort_command)
      report.info(ctx, "package.format", "formatting code")
      ctx.run(black_command)